1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IMG I2S input controller driver
4 *
5 * Copyright (C) 2015 Imagination Technologies Ltd.
6 *
7 * Author: Damien Horsley <Damien.Horsley@imgtec.com>
8 */
9
10 #include <linux/clk.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/reset.h>
18
19 #include <sound/core.h>
20 #include <sound/dmaengine_pcm.h>
21 #include <sound/initval.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
24 #include <sound/soc.h>
25
26 #define IMG_I2S_IN_RX_FIFO 0x0
27
28 #define IMG_I2S_IN_CTL 0x4
29 #define IMG_I2S_IN_CTL_ACTIVE_CHAN_MASK 0xfffffffc
30 #define IMG_I2S_IN_CTL_ACTIVE_CH_SHIFT 2
31 #define IMG_I2S_IN_CTL_16PACK_MASK BIT(1)
32 #define IMG_I2S_IN_CTL_ME_MASK BIT(0)
33
34 #define IMG_I2S_IN_CH_CTL 0x4
35 #define IMG_I2S_IN_CH_CTL_CCDEL_MASK 0x38000
36 #define IMG_I2S_IN_CH_CTL_CCDEL_SHIFT 15
37 #define IMG_I2S_IN_CH_CTL_FEN_MASK BIT(14)
38 #define IMG_I2S_IN_CH_CTL_FMODE_MASK BIT(13)
39 #define IMG_I2S_IN_CH_CTL_16PACK_MASK BIT(12)
40 #define IMG_I2S_IN_CH_CTL_JUST_MASK BIT(10)
41 #define IMG_I2S_IN_CH_CTL_PACKH_MASK BIT(9)
42 #define IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK BIT(8)
43 #define IMG_I2S_IN_CH_CTL_BLKP_MASK BIT(7)
44 #define IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK BIT(6)
45 #define IMG_I2S_IN_CH_CTL_LRD_MASK BIT(3)
46 #define IMG_I2S_IN_CH_CTL_FW_MASK BIT(2)
47 #define IMG_I2S_IN_CH_CTL_SW_MASK BIT(1)
48 #define IMG_I2S_IN_CH_CTL_ME_MASK BIT(0)
49
50 #define IMG_I2S_IN_CH_STRIDE 0x20
51
52 struct img_i2s_in {
53 void __iomem *base;
54 struct clk *clk_sys;
55 struct snd_dmaengine_dai_dma_data dma_data;
56 struct device *dev;
57 unsigned int max_i2s_chan;
58 void __iomem *channel_base;
59 unsigned int active_channels;
60 struct snd_soc_dai_driver dai_driver;
61 u32 suspend_ctl;
62 u32 *suspend_ch_ctl;
63 };
64
img_i2s_in_runtime_suspend(struct device * dev)65 static int img_i2s_in_runtime_suspend(struct device *dev)
66 {
67 struct img_i2s_in *i2s = dev_get_drvdata(dev);
68
69 clk_disable_unprepare(i2s->clk_sys);
70
71 return 0;
72 }
73
img_i2s_in_runtime_resume(struct device * dev)74 static int img_i2s_in_runtime_resume(struct device *dev)
75 {
76 struct img_i2s_in *i2s = dev_get_drvdata(dev);
77 int ret;
78
79 ret = clk_prepare_enable(i2s->clk_sys);
80 if (ret) {
81 dev_err(dev, "Unable to enable sys clock\n");
82 return ret;
83 }
84
85 return 0;
86 }
87
img_i2s_in_writel(struct img_i2s_in * i2s,u32 val,u32 reg)88 static inline void img_i2s_in_writel(struct img_i2s_in *i2s, u32 val, u32 reg)
89 {
90 writel(val, i2s->base + reg);
91 }
92
img_i2s_in_readl(struct img_i2s_in * i2s,u32 reg)93 static inline u32 img_i2s_in_readl(struct img_i2s_in *i2s, u32 reg)
94 {
95 return readl(i2s->base + reg);
96 }
97
img_i2s_in_ch_writel(struct img_i2s_in * i2s,u32 chan,u32 val,u32 reg)98 static inline void img_i2s_in_ch_writel(struct img_i2s_in *i2s, u32 chan,
99 u32 val, u32 reg)
100 {
101 writel(val, i2s->channel_base + (chan * IMG_I2S_IN_CH_STRIDE) + reg);
102 }
103
img_i2s_in_ch_readl(struct img_i2s_in * i2s,u32 chan,u32 reg)104 static inline u32 img_i2s_in_ch_readl(struct img_i2s_in *i2s, u32 chan,
105 u32 reg)
106 {
107 return readl(i2s->channel_base + (chan * IMG_I2S_IN_CH_STRIDE) + reg);
108 }
109
img_i2s_in_ch_disable(struct img_i2s_in * i2s,u32 chan)110 static inline void img_i2s_in_ch_disable(struct img_i2s_in *i2s, u32 chan)
111 {
112 u32 reg;
113
114 reg = img_i2s_in_ch_readl(i2s, chan, IMG_I2S_IN_CH_CTL);
115 reg &= ~IMG_I2S_IN_CH_CTL_ME_MASK;
116 img_i2s_in_ch_writel(i2s, chan, reg, IMG_I2S_IN_CH_CTL);
117 }
118
img_i2s_in_ch_enable(struct img_i2s_in * i2s,u32 chan)119 static inline void img_i2s_in_ch_enable(struct img_i2s_in *i2s, u32 chan)
120 {
121 u32 reg;
122
123 reg = img_i2s_in_ch_readl(i2s, chan, IMG_I2S_IN_CH_CTL);
124 reg |= IMG_I2S_IN_CH_CTL_ME_MASK;
125 img_i2s_in_ch_writel(i2s, chan, reg, IMG_I2S_IN_CH_CTL);
126 }
127
img_i2s_in_disable(struct img_i2s_in * i2s)128 static inline void img_i2s_in_disable(struct img_i2s_in *i2s)
129 {
130 u32 reg;
131
132 reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
133 reg &= ~IMG_I2S_IN_CTL_ME_MASK;
134 img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL);
135 }
136
img_i2s_in_enable(struct img_i2s_in * i2s)137 static inline void img_i2s_in_enable(struct img_i2s_in *i2s)
138 {
139 u32 reg;
140
141 reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
142 reg |= IMG_I2S_IN_CTL_ME_MASK;
143 img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL);
144 }
145
img_i2s_in_flush(struct img_i2s_in * i2s)146 static inline void img_i2s_in_flush(struct img_i2s_in *i2s)
147 {
148 int i;
149 u32 reg;
150
151 for (i = 0; i < i2s->active_channels; i++) {
152 reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
153 reg |= IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK;
154 img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
155 reg &= ~IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK;
156 img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
157 }
158 }
159
img_i2s_in_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)160 static int img_i2s_in_trigger(struct snd_pcm_substream *substream, int cmd,
161 struct snd_soc_dai *dai)
162 {
163 struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
164
165 switch (cmd) {
166 case SNDRV_PCM_TRIGGER_START:
167 case SNDRV_PCM_TRIGGER_RESUME:
168 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
169 img_i2s_in_enable(i2s);
170 break;
171
172 case SNDRV_PCM_TRIGGER_STOP:
173 case SNDRV_PCM_TRIGGER_SUSPEND:
174 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
175 img_i2s_in_disable(i2s);
176 break;
177 default:
178 return -EINVAL;
179 }
180
181 return 0;
182 }
183
img_i2s_in_check_rate(struct img_i2s_in * i2s,unsigned int sample_rate,unsigned int frame_size,unsigned int * bclk_filter_enable,unsigned int * bclk_filter_value)184 static int img_i2s_in_check_rate(struct img_i2s_in *i2s,
185 unsigned int sample_rate, unsigned int frame_size,
186 unsigned int *bclk_filter_enable,
187 unsigned int *bclk_filter_value)
188 {
189 unsigned int bclk_freq, cur_freq;
190
191 bclk_freq = sample_rate * frame_size;
192
193 cur_freq = clk_get_rate(i2s->clk_sys);
194
195 if (cur_freq >= bclk_freq * 8) {
196 *bclk_filter_enable = 1;
197 *bclk_filter_value = 0;
198 } else if (cur_freq >= bclk_freq * 7) {
199 *bclk_filter_enable = 1;
200 *bclk_filter_value = 1;
201 } else if (cur_freq >= bclk_freq * 6) {
202 *bclk_filter_enable = 0;
203 *bclk_filter_value = 0;
204 } else {
205 dev_err(i2s->dev,
206 "Sys clock rate %u insufficient for sample rate %u\n",
207 cur_freq, sample_rate);
208 return -EINVAL;
209 }
210
211 return 0;
212 }
213
img_i2s_in_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)214 static int img_i2s_in_hw_params(struct snd_pcm_substream *substream,
215 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
216 {
217 struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
218 unsigned int rate, channels, i2s_channels, frame_size;
219 unsigned int bclk_filter_enable, bclk_filter_value;
220 int i, ret = 0;
221 u32 reg, control_mask, chan_control_mask;
222 u32 control_set = 0, chan_control_set = 0;
223 snd_pcm_format_t format;
224
225 rate = params_rate(params);
226 format = params_format(params);
227 channels = params_channels(params);
228 i2s_channels = channels / 2;
229
230 switch (format) {
231 case SNDRV_PCM_FORMAT_S32_LE:
232 frame_size = 64;
233 chan_control_set |= IMG_I2S_IN_CH_CTL_SW_MASK;
234 chan_control_set |= IMG_I2S_IN_CH_CTL_FW_MASK;
235 chan_control_set |= IMG_I2S_IN_CH_CTL_PACKH_MASK;
236 break;
237 case SNDRV_PCM_FORMAT_S24_LE:
238 frame_size = 64;
239 chan_control_set |= IMG_I2S_IN_CH_CTL_SW_MASK;
240 chan_control_set |= IMG_I2S_IN_CH_CTL_FW_MASK;
241 break;
242 case SNDRV_PCM_FORMAT_S16_LE:
243 frame_size = 32;
244 control_set |= IMG_I2S_IN_CTL_16PACK_MASK;
245 chan_control_set |= IMG_I2S_IN_CH_CTL_16PACK_MASK;
246 break;
247 default:
248 return -EINVAL;
249 }
250
251 if ((channels < 2) ||
252 (channels > (i2s->max_i2s_chan * 2)) ||
253 (channels % 2))
254 return -EINVAL;
255
256 control_set |= ((i2s_channels - 1) << IMG_I2S_IN_CTL_ACTIVE_CH_SHIFT);
257
258 ret = img_i2s_in_check_rate(i2s, rate, frame_size,
259 &bclk_filter_enable, &bclk_filter_value);
260 if (ret < 0)
261 return ret;
262
263 if (bclk_filter_enable)
264 chan_control_set |= IMG_I2S_IN_CH_CTL_FEN_MASK;
265
266 if (bclk_filter_value)
267 chan_control_set |= IMG_I2S_IN_CH_CTL_FMODE_MASK;
268
269 control_mask = IMG_I2S_IN_CTL_16PACK_MASK |
270 IMG_I2S_IN_CTL_ACTIVE_CHAN_MASK;
271
272 chan_control_mask = IMG_I2S_IN_CH_CTL_16PACK_MASK |
273 IMG_I2S_IN_CH_CTL_FEN_MASK |
274 IMG_I2S_IN_CH_CTL_FMODE_MASK |
275 IMG_I2S_IN_CH_CTL_SW_MASK |
276 IMG_I2S_IN_CH_CTL_FW_MASK |
277 IMG_I2S_IN_CH_CTL_PACKH_MASK;
278
279 reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
280 reg = (reg & ~control_mask) | control_set;
281 img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL);
282
283 for (i = 0; i < i2s->active_channels; i++)
284 img_i2s_in_ch_disable(i2s, i);
285
286 for (i = 0; i < i2s->max_i2s_chan; i++) {
287 reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
288 reg = (reg & ~chan_control_mask) | chan_control_set;
289 img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
290 }
291
292 i2s->active_channels = i2s_channels;
293
294 img_i2s_in_flush(i2s);
295
296 for (i = 0; i < i2s->active_channels; i++)
297 img_i2s_in_ch_enable(i2s, i);
298
299 return 0;
300 }
301
img_i2s_in_set_fmt(struct snd_soc_dai * dai,unsigned int fmt)302 static int img_i2s_in_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
303 {
304 struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
305 int i, ret;
306 u32 chan_control_mask, lrd_set = 0, blkp_set = 0, chan_control_set = 0;
307 u32 reg;
308
309 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
310 case SND_SOC_DAIFMT_NB_NF:
311 lrd_set |= IMG_I2S_IN_CH_CTL_LRD_MASK;
312 break;
313 case SND_SOC_DAIFMT_NB_IF:
314 break;
315 case SND_SOC_DAIFMT_IB_NF:
316 lrd_set |= IMG_I2S_IN_CH_CTL_LRD_MASK;
317 blkp_set |= IMG_I2S_IN_CH_CTL_BLKP_MASK;
318 break;
319 case SND_SOC_DAIFMT_IB_IF:
320 blkp_set |= IMG_I2S_IN_CH_CTL_BLKP_MASK;
321 break;
322 default:
323 return -EINVAL;
324 }
325
326 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
327 case SND_SOC_DAIFMT_I2S:
328 chan_control_set |= IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK;
329 break;
330 case SND_SOC_DAIFMT_LEFT_J:
331 break;
332 default:
333 return -EINVAL;
334 }
335
336 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
337 case SND_SOC_DAIFMT_CBM_CFM:
338 break;
339 default:
340 return -EINVAL;
341 }
342
343 chan_control_mask = IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK;
344
345 ret = pm_runtime_resume_and_get(i2s->dev);
346 if (ret < 0)
347 return ret;
348
349 for (i = 0; i < i2s->active_channels; i++)
350 img_i2s_in_ch_disable(i2s, i);
351
352 /*
353 * BLKP and LRD must be set during separate register writes
354 */
355 for (i = 0; i < i2s->max_i2s_chan; i++) {
356 reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
357 reg = (reg & ~chan_control_mask) | chan_control_set;
358 img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
359 reg = (reg & ~IMG_I2S_IN_CH_CTL_BLKP_MASK) | blkp_set;
360 img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
361 reg = (reg & ~IMG_I2S_IN_CH_CTL_LRD_MASK) | lrd_set;
362 img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
363 }
364
365 for (i = 0; i < i2s->active_channels; i++)
366 img_i2s_in_ch_enable(i2s, i);
367
368 pm_runtime_put(i2s->dev);
369
370 return 0;
371 }
372
373 static const struct snd_soc_dai_ops img_i2s_in_dai_ops = {
374 .trigger = img_i2s_in_trigger,
375 .hw_params = img_i2s_in_hw_params,
376 .set_fmt = img_i2s_in_set_fmt
377 };
378
img_i2s_in_dai_probe(struct snd_soc_dai * dai)379 static int img_i2s_in_dai_probe(struct snd_soc_dai *dai)
380 {
381 struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
382
383 snd_soc_dai_init_dma_data(dai, NULL, &i2s->dma_data);
384
385 return 0;
386 }
387
388 static const struct snd_soc_component_driver img_i2s_in_component = {
389 .name = "img-i2s-in"
390 };
391
img_i2s_in_dma_prepare_slave_config(struct snd_pcm_substream * st,struct snd_pcm_hw_params * params,struct dma_slave_config * sc)392 static int img_i2s_in_dma_prepare_slave_config(struct snd_pcm_substream *st,
393 struct snd_pcm_hw_params *params, struct dma_slave_config *sc)
394 {
395 unsigned int i2s_channels = params_channels(params) / 2;
396 struct snd_soc_pcm_runtime *rtd = st->private_data;
397 struct snd_dmaengine_dai_dma_data *dma_data;
398 int ret;
399
400 dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), st);
401
402 ret = snd_hwparams_to_dma_slave_config(st, params, sc);
403 if (ret)
404 return ret;
405
406 sc->src_addr = dma_data->addr;
407 sc->src_addr_width = dma_data->addr_width;
408 sc->src_maxburst = 4 * i2s_channels;
409
410 return 0;
411 }
412
413 static const struct snd_dmaengine_pcm_config img_i2s_in_dma_config = {
414 .prepare_slave_config = img_i2s_in_dma_prepare_slave_config
415 };
416
img_i2s_in_probe(struct platform_device * pdev)417 static int img_i2s_in_probe(struct platform_device *pdev)
418 {
419 struct img_i2s_in *i2s;
420 struct resource *res;
421 void __iomem *base;
422 int ret, i;
423 struct reset_control *rst;
424 unsigned int max_i2s_chan_pow_2;
425 struct device *dev = &pdev->dev;
426
427 i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
428 if (!i2s)
429 return -ENOMEM;
430
431 platform_set_drvdata(pdev, i2s);
432
433 i2s->dev = dev;
434
435 base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
436 if (IS_ERR(base))
437 return PTR_ERR(base);
438
439 i2s->base = base;
440
441 if (of_property_read_u32(pdev->dev.of_node, "img,i2s-channels",
442 &i2s->max_i2s_chan)) {
443 dev_err(dev, "No img,i2s-channels property\n");
444 return -EINVAL;
445 }
446
447 max_i2s_chan_pow_2 = 1 << get_count_order(i2s->max_i2s_chan);
448
449 i2s->channel_base = base + (max_i2s_chan_pow_2 * 0x20);
450
451 i2s->clk_sys = devm_clk_get(dev, "sys");
452 if (IS_ERR(i2s->clk_sys))
453 return dev_err_probe(dev, PTR_ERR(i2s->clk_sys),
454 "Failed to acquire clock 'sys'\n");
455
456 pm_runtime_enable(&pdev->dev);
457 if (!pm_runtime_enabled(&pdev->dev)) {
458 ret = img_i2s_in_runtime_resume(&pdev->dev);
459 if (ret)
460 goto err_pm_disable;
461 }
462 ret = pm_runtime_resume_and_get(&pdev->dev);
463 if (ret < 0)
464 goto err_suspend;
465
466 i2s->active_channels = 1;
467 i2s->dma_data.addr = res->start + IMG_I2S_IN_RX_FIFO;
468 i2s->dma_data.addr_width = 4;
469
470 i2s->dai_driver.probe = img_i2s_in_dai_probe;
471 i2s->dai_driver.capture.channels_min = 2;
472 i2s->dai_driver.capture.channels_max = i2s->max_i2s_chan * 2;
473 i2s->dai_driver.capture.rates = SNDRV_PCM_RATE_8000_192000;
474 i2s->dai_driver.capture.formats = SNDRV_PCM_FMTBIT_S32_LE |
475 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE;
476 i2s->dai_driver.ops = &img_i2s_in_dai_ops;
477
478 rst = devm_reset_control_get_exclusive(dev, "rst");
479 if (IS_ERR(rst)) {
480 if (PTR_ERR(rst) == -EPROBE_DEFER) {
481 ret = -EPROBE_DEFER;
482 pm_runtime_put(&pdev->dev);
483 goto err_suspend;
484 }
485
486 dev_dbg(dev, "No top level reset found\n");
487
488 img_i2s_in_disable(i2s);
489
490 for (i = 0; i < i2s->max_i2s_chan; i++)
491 img_i2s_in_ch_disable(i2s, i);
492 } else {
493 reset_control_assert(rst);
494 reset_control_deassert(rst);
495 }
496
497 img_i2s_in_writel(i2s, 0, IMG_I2S_IN_CTL);
498
499 for (i = 0; i < i2s->max_i2s_chan; i++)
500 img_i2s_in_ch_writel(i2s, i,
501 (4 << IMG_I2S_IN_CH_CTL_CCDEL_SHIFT) |
502 IMG_I2S_IN_CH_CTL_JUST_MASK |
503 IMG_I2S_IN_CH_CTL_FW_MASK, IMG_I2S_IN_CH_CTL);
504
505 pm_runtime_put(&pdev->dev);
506
507 i2s->suspend_ch_ctl = devm_kcalloc(dev,
508 i2s->max_i2s_chan, sizeof(*i2s->suspend_ch_ctl), GFP_KERNEL);
509 if (!i2s->suspend_ch_ctl) {
510 ret = -ENOMEM;
511 goto err_suspend;
512 }
513
514 ret = devm_snd_soc_register_component(dev, &img_i2s_in_component,
515 &i2s->dai_driver, 1);
516 if (ret)
517 goto err_suspend;
518
519 ret = devm_snd_dmaengine_pcm_register(dev, &img_i2s_in_dma_config, 0);
520 if (ret)
521 goto err_suspend;
522
523 return 0;
524
525 err_suspend:
526 if (!pm_runtime_enabled(&pdev->dev))
527 img_i2s_in_runtime_suspend(&pdev->dev);
528 err_pm_disable:
529 pm_runtime_disable(&pdev->dev);
530
531 return ret;
532 }
533
img_i2s_in_dev_remove(struct platform_device * pdev)534 static int img_i2s_in_dev_remove(struct platform_device *pdev)
535 {
536 pm_runtime_disable(&pdev->dev);
537 if (!pm_runtime_status_suspended(&pdev->dev))
538 img_i2s_in_runtime_suspend(&pdev->dev);
539
540 return 0;
541 }
542
543 #ifdef CONFIG_PM_SLEEP
img_i2s_in_suspend(struct device * dev)544 static int img_i2s_in_suspend(struct device *dev)
545 {
546 struct img_i2s_in *i2s = dev_get_drvdata(dev);
547 int i, ret;
548 u32 reg;
549
550 if (pm_runtime_status_suspended(dev)) {
551 ret = img_i2s_in_runtime_resume(dev);
552 if (ret)
553 return ret;
554 }
555
556 for (i = 0; i < i2s->max_i2s_chan; i++) {
557 reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
558 i2s->suspend_ch_ctl[i] = reg;
559 }
560
561 i2s->suspend_ctl = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
562
563 img_i2s_in_runtime_suspend(dev);
564
565 return 0;
566 }
567
img_i2s_in_resume(struct device * dev)568 static int img_i2s_in_resume(struct device *dev)
569 {
570 struct img_i2s_in *i2s = dev_get_drvdata(dev);
571 int i, ret;
572 u32 reg;
573
574 ret = img_i2s_in_runtime_resume(dev);
575 if (ret)
576 return ret;
577
578 for (i = 0; i < i2s->max_i2s_chan; i++) {
579 reg = i2s->suspend_ch_ctl[i];
580 img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
581 }
582
583 img_i2s_in_writel(i2s, i2s->suspend_ctl, IMG_I2S_IN_CTL);
584
585 if (pm_runtime_status_suspended(dev))
586 img_i2s_in_runtime_suspend(dev);
587
588 return 0;
589 }
590 #endif
591
592 static const struct of_device_id img_i2s_in_of_match[] = {
593 { .compatible = "img,i2s-in" },
594 {}
595 };
596 MODULE_DEVICE_TABLE(of, img_i2s_in_of_match);
597
598 static const struct dev_pm_ops img_i2s_in_pm_ops = {
599 SET_RUNTIME_PM_OPS(img_i2s_in_runtime_suspend,
600 img_i2s_in_runtime_resume, NULL)
601 SET_SYSTEM_SLEEP_PM_OPS(img_i2s_in_suspend, img_i2s_in_resume)
602 };
603
604 static struct platform_driver img_i2s_in_driver = {
605 .driver = {
606 .name = "img-i2s-in",
607 .of_match_table = img_i2s_in_of_match,
608 .pm = &img_i2s_in_pm_ops
609 },
610 .probe = img_i2s_in_probe,
611 .remove = img_i2s_in_dev_remove
612 };
613 module_platform_driver(img_i2s_in_driver);
614
615 MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
616 MODULE_DESCRIPTION("IMG I2S Input Driver");
617 MODULE_LICENSE("GPL v2");
618